hemmer



IJFRALEIGI-I 80 P. L. HEMMER.

(No Model'.

ROTARY STOCK CUTTER.

Patented Nov. 8, 1892.

7 fi 1 Aiiorney.

UNiTED STATES PATENT 4 OFFICE.

ISAAC FRALEIGH AND FREDERICK L. HEMMER, OF PoUeHKEEPsI NEW YORK. v I A p ROTARY STOCK-CUTTER.

SPECIFICATION forming partof Letters Patent No. 485,792, dated November 8, 1892.

Application filed April 12, 1892. Serial No. 428,838. (No model.)

To all whom it may concern.-

Be it known that we, ISAAC FRALEIGH and FREDERIeK L. I-IEMMER, citizens of the United States, residing at Poughkeepsie, in theeounty of Dutchess and State of New York, have invented certain new and useful Improvements in Rotary Stock-Cutters; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use thesame.

Our invention relates to improvements in rotary stock-cutters in which the cuttingknives are held in place between two clamping disks or washers attached to a spindle. Hitherto the slightest variation in the width of the two cutting-knives when they were fastened in place between the clamping-disks or in the depth of the grooves which hold them would tend to warp or bend the outer end of the spindle when the movable but rigidlyhorizontal clamp was driven to place against the knives with suiiieient force by the nut in the ordinary way for holding knives securely in position. The great speed at which the cutter-head must be driven in a so-called variety machine or planer to do its work properly in cutting the stock, more than three thousand revolutions per minute being usual, has resulted in a great straining of the ma chine and consequent wear of its several parts whenever the spindle has been in the least degree warped from its true axis or revolution. In point of fact it has been found impossible in most cases, even in a new rotary cutter-head, to'fit the cutting-knives or their grooves so accurately as not to cause in some degree a variation of the disks from the horizontal plane, and to this extent bend the spindle from its axis, if the ordinary clamping-disks are used to hold the knives; but even if the cutter-head knives and grooves are accurately fitted at first the dilterenee in the temper of the metal will in the constant use of the cutter-head at high speed cause some variation in the width of the knives or the depth of the grooves.

It is the object of our invention to entirely obviate these practical disadvantages and to make it possible to fasten knives, which vary in width or lie in grooves of diiterent depths securely in place without in the least knives in place to better show the relation of all the parts; and Fig. 3 is a plan view showing the lower side of the upper clamping-disk constructed as hereinafter described.

Si milar letters refer to similar parts through out the several views.

In the drawings, A represents the ordinary spindle, threaded at a, and B represents the usual rigid clamping disk, provided with grooves g g, fitted to receive the lower edges of the cutting-knives G H. The upper clamping-disk O has the ordinary grooves g g, corresponding with those in B and holding the upper edges of the knives G H; but instead of making this disk rigidly horizontal in its movement upon the spindle we construct it so as to be adjustable horizontally as well as vertically by providingit with a central opening I, slightly larger than the spindle, and a raised portion 0, eoneaved at its interior, so as to receive the upper portion of the round ball D. The ball D is provided with a hole in its center just large enough to move upon the spindle A and is held to place on the clampingdisk C by a recessed rim E,having its interior diameter slightly less than the exterior diameter of D. E is attached to O by the set-screws e e, as shown in Figs. 2 and 3. The ordinary nut F is only changed in construetion by having its flange fconcaved to correspond with the convex upper surface 0 of the disk 0 to permit the ready adjustment of C out of its horizontal plane. It is evident that the introduction of a ball-joint, as herein described, in one of the clampingdisks of a rotary stock-cutter successfully obviates the serious disadvantages of bending the spindle by any variation in the horizontal planes of the disks of the cutter-head; but to represent this feature more clearly the cutting-knifeH "has been shown in Fig. 2 of the drawings to be wider than the knife G, and this difference is indicated by the fine dotted lines. In Fig. 1 the lower broken line accentuates the horizontal plane of the lower clamping-disk B, and the canted plane of the upper disk 0 is accentuated by the upper broken line.

The object of our invention being to provide for the necessary variation of knives or grooves in a rotary stock-cutter by the introduction of a clamping-disk adjust-able horizontally, we do not confine ourselves to the precise construction of a ball-joint shown in the drawings. The adjustable disk might be constructed with its parts reversed as to con vexity and concavity, the nut-flange fand the ball D being correspondingly changed, without altering the scope of our invention, or the lower disk B might be made adjustable horizontally instead of C; but that construction would not be as convenient as the one above described.

What we claim, therefore, as our invention, and desire to' secure by Letters Patent,.is

1. In a rotary stock-cutter, the combination, with a spindle and fixed clamping-disk, of a ball carried by said spindle and free to slide l thereupon, a movable clamping-disk carried by said spindle and free to rock thereon and embracing said ball, and means for clamping the cutters between said disks, substantially as set forth.

2. In arot-ary stock-cutter, the combination, with a spindle and fixed clamping-disk, of a ball carried by said spindle and free to slide thereupon, a movable clamping-disk carried by said spindle and free to rock thereupon and pro 'ided with a concave portion which embraces said ball, and a nut for clamping the parts against the cutters, substantially as set forth.

3. In a rotary stock cutter, an adjustable cutter-head consisting of a clamping-disk B, attached rigidly to the spindle A, in combination with a movable clamping-disk 0, concaved at c, and a ball D, surrounding the spindle A and held in place within the corresponding concavity of the disk C by the recessed rim E and the set-screws e e, substantially as and for the purpose specified.

In testimony whereof we affix our signatures in presence of two witnesses.

ISAAC FRALEIGH. FREDERICK L. HEMMER. Witnesses: I

MARTIN HEERMANCE, IRVING ELTING. 

